[w3c/manifest] At risk: ManifestImageResource.platform? (#909)

I believe [`ManifestImageResource.platform`](https://www.w3.org/TR/appmanifest/#platform-member) should be considered at risk. I don't think Chrome implements it ([`ParseIcons`](https://source.chromium.org/chromium/chromium/src/+/master:third_party/blink/renderer/modules/manifest/manifest_parser.cc;l=387;drc=730040c92ecd7b32a67faa689133d3074e149157;bpv=1;bpt=1) in Chrome's manifest parser doesn't look at the `"platform"` member). And I don't think it's necessary. Does Gecko or WebKit implement this?

Since we added `maskable` and `monochrome`, we're trending towards specifying purposes with specialized semantics, but not specific to any OS. I think that's much better than letting developers supply specific icons for each OS.

I think it can be removed.

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